"The United States believes that Russia is responsible for the attack on two people in the United Kingdom, using a military-grade nerve agent," US Ambassador Nikki Haley told an emergency council meeting.
As one of the council's five permanent members, Russia is entrusted by the United Nations with upholding international peace and security, Haley said.
Britain called the emergency meeting to rally support in its standoff with Russia over the attack that British Deputy Ambassador Jonathan Allen said was "state-sponsored."
"We ask you today to stand by us," Allen told the council.
"This was a reckless and indiscriminate act that put at risk the lives of civilians."
Moscow has denied any involvement in the attack using the nerve agent Novichok, which was developed by the Soviet Union and later inherited by Russia.
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